Oracle-L: RE: Oracle position on hints

From: <Jared.Still_at_radisys.com>
Date: Mon, 10 Mar 2003 10:09:20 -0800
Message-ID: <F001.00564D5B.20030310100920@fatcity.com>

Well, I wouldn't say you should *always* use bind variables.

Many situations in a database warehouse preclude that.

Potentially long running queries may need to have literals to help the CBO make the right choice.

Star transforms don't work with bind variables, and histograms can't be used with bind variables.

Jared

"Nicoll, Iain" <IAIN.D.NICOLL_at_saic.com>
Sent by: root_at_fatcity.com
03/08/2003 06:23 AM
Please respond to ORACLE-L

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Subject:        RE: Oracle position on hints

Given the attitude of most dba's that you should always use bind variables where possible I can't see how you'd cope with skewed data without them. Most developers should know a databases's data better than the optimiser and
certainly when building queries it's always worthwhile seeing where data is
being most effectively filtered.

There are lots of mature systems out there where the data characteristics are unlikely to change much and for most in-house developers you're never going to have to think about portability but always about performance.

Iain Nicoll
-----Original Message-----
Sent: 07 March 2003 16:04
To: Multiple recipients of list ORACLE-L

Hi,

Does Oracle have an official position on hints ? Will they go away as the optimiser is becoming bettre or they are there to stay ?

TIA Stephane Paquette

Administrateur de bases de donnees

Database Administrator

Standard Life

www.standardlife.ca

Tél. (514) 925-7187

stephane.paquette_at_standardlife.ca <mailto:stephane.paquette_at_standardlife.ca>

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Author: Nicoll, Iain
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